Mucking machine dipper hoisting means



NOV. 1, 1938. W. A, WH|TM|RE 2,134,992

MUCKING MACHINE DIPPER HOISTING MEANS FiledvAug. 4, 1937 'T1-gf.

Patented Nov. 1, 193s UNITED STATI-:s

PATENT OFFICE MUCKING MACHINE DIFFER noIsTING o MEANS William A. Whitmire, Boca, Calif. Application Augustli, 1937, Serial No. 157,331

sciaims. (01.214-134) Y This invention, a mucking machine dip-per hoisting system presents as its main feature a hoisting system for excavating and mucking machine dippers which automatically compensates Patent No. 2,086,687, issued July 13, 1937, and

may be substituted for the hoisting mechanism shown therein, and also in conjunction with `the improvements disclosed in my Patent No. 2,067,879, issued January 12, 1937, and mycopending applications, Serial. No. 157,330, led Aug. 4, 1937, and Serial No. 157,332, filed Aug. 4, 1937, and respectively covering a mucking `machine dipper, and, a mucking machine and conveyor system, and may also be incorporated in other rigid clipper arm types of mucking and excrowd during advance and retraction of the dip-Y per so long as the means for actual raising and lowering of the dipper is not placed in operation.

Third; to provide a hoisting `system in which the compensating means is operated directly through the medium of the crowding means, whereby compensation will be automatic and positive in character.

Other objects and advantages of the invention will become apparent as the following description is read on the drawing forming a part of this specification, and in which similar reference characters are used to designate similar parts throughout the several views, of which;

Fig. l is a plan View of the invention.

Fig. 2 is a side elevation of Fig. 1.

'Ihe bucket or dipper I0, wrist joint H, and the dipper stick arrangement l2 are shown in a type as disclosed in my patents and applications previously referred to, but the invention is not `medium of `the drive 2l to 30 which is suitably limited to this specic arrangement, and can be used with other types of dippers and with dipper i sticks or arms of rigid construction.

The bail I3 is p-ivoted to the sides o-f the dipper as indicated at I4, and the back-stop l5 for 5 the bail has a specific function to perform when a pivoted bail is used in connection with the wrist'joint, as will be hereinafter described.

The mucking machine has acarriage orsupporting frame i6, and av muckingsection frame I7 is swivelly supported thereon'and includes a crowd I8 which is operated for advance and retraction by means of a pinion I9 lcooperating with the rack which is integral with the crowd l8,.or ailxed thereto. Any other suitable type- 15;

of crowding means may obviouslyv be substituted and the order reversed b-y having the rack drive the pinion when the crowd is iiuid operated, as by a steam or air engine or by a hydraulic jack.

The pinion I9 is fixed on a shaft 2E, and this 20 shaft may be driven by any suitable power mechanism and reduction gearing, and is here shown as driven through a speed reducer 22, and chain or belt 23 operatingv over sprockets or pulleys 24 and 25, illustrating the drive arrangement in 25 the simplest manner, since suitable drives and controls are well known inthe art and require no detailed description.

A separate Winch or hoisting drum shaft 25 is driven by suitable means, and isvhere shown 3.0`

as driven through a speed reducer 21, pulleys 28 and 29 and belt 3i), the controls for the drive not beingshown, sinceanyk conventional type of control may be used. v

Mounted on the respective ends ofshaft 2S are 35 the respective hoisting drums 3| and 32. Two compensating drums33 andk 34 are respectively mounted on the respective ends of the pinion shaft 2l and have a diameter substantially twice the pitch diameter of the pinion, since the cable payout must be substantially twice the crowd movement to maintain the dipper on an even keel or in` a uniform plane or position relative to the crowd as the crowd is advanced and retracted.

One cable 35-has one-end secured. to the drum 32 and isl wound and unwoundA thereon for hoisting and lowering the dipper through the controlled by known means.Y

-From this drum 32, the cable passes over a sheave 36 which is rotatable on shaft 3l mounted `at the top of the frame, then continues down and aboutthe sheave 38 which is rotatably supported on` a shaft 39, which in turnis supported bythe 5.5

links 4l] connected to the bail I3 at 4I. The cable then continues upwardly to and over a second sheave 43 which is also rotatable on the shaft 31, and thence down and about the drum 34 to which the other end of this cable is secured.

Another cable 44 has one end secured to the drum 3 I, passes over sheave 45, then about sheave 46, up and over sheave 41 and down to drum 33 to which the other end of the cable is attached.

With this arrangement, when the hoisting drums are stationary and the crowd is moved either forwardly or backwardly, the compensating drums rotate with the pinion and either take up or pay out the cable in 'just theright amount to maintain the relative position of the dipper and crowd.

Thus, when the crowd is driven forward by pinion I9, cables and 44 are paid out from drums 34 and 33 at approximately twice the speed of movement of the crowdyand while the hoisting drums 3| and 32 are stationary, the bail sheave shaft 39 travels at the same speed as the crowd, and the dipper is maintained on an even keel or in the same relation tothe crowd due to the fact that the bail is cooperating with the back stop I5 and thereby forms a long rigid lever arm measured from the wrist connection.

Latching means is provided for the dipper and consists of a latch 46 for each side of the dipper, pivoted at 49 and having aI counterweight 50 at one end and a release arm 5I at the other end, and the latch cooperates with the cross bar 52 which is xed to the cover 53 which is hinged at 54. Release members 55 are fixed on the frame I'a' in cooperative relation to the arms 5I, whereby as the dipper is hoisted to its highest position, at which point the dipper is inverted due to the action of the crossed dipper sticks I2, the arms 5I cooperate with the release members, 55 and release the cover to permit the muck to dump from the dipper. As the dipper is again lowered, the arms 5I are freed from stops 55 and-the counterweight automatically causes the latch to engage and secure the cover in closed position.

The crowd may be advanced Vor retracted and the dipper coincidently raised or lowered by the hoisting means, or kept in the existent relation to the crowd merely by control of the hoisting drums, 3l and 32, which function the same, with the same payout and takeup of cable, whether the crowd is moving or stationary, thus provid-A ing for accuracy of control and speed. The drums 33 and 34 function automatically to maintain an exact relation of dipper to hoisting drum soy far as hoisting cable movement is concerned, facilitating and simplifying operation of the machine and increasing efficiency and speed of operation. i

It will be understood that variations in arrangement and construction of parts, which variations are consistent with the appended claims, may be resorted to without detracting from the spirit or scope of the invention, or sacrificing any of the advantages thereof.

I claim:

1. Dipper hoisting means for a mucking machine having a frame, a dipper, va crowd and driving means therefor, a hoisting drum and driving means therefor, a compensating drum operatively associated' with said crowd, a pair of sheaves rotatably mounted on said frame, a single sheave associated with said dipper, and a cable having one end` associated with said hoisting drum and its other end associated with said compensating drum, the intermediate portion of said cable passing over one of said pair of sheaves, thence about said single sheave and thence over the other of said pair of sheaves, the payout of said cable from said compensating drum being substantially twice the advance movement of said crowd.

2. A hoisting system for a mucking machine having a crowd and operating means therefor, and a mucking section frame, a dipper having a bail and a sheave associated with said bail, a

compensating drum operatively associated with said crowd, a hoisting drum and driving means therefor, a pair of sheaves rotatably supported on saidframe, and a cable passing about said dipper sheave and the respective ends passing over the respective sheaves of said pair and to the respective drums.

3. A structure as claimed in claim 2, said bail being pivoted to said dipper, and a back stop for 5. Ahoisting system for a mucking machine f having a crowd provided with a rack, and a pinion cooperating with said rack, and a shaft for said pinion, a dipper having a bail pivotally attached to the sides thereof, and back stop means for limiting the backward swing of said bail about its pivotal points to a position inclined forwardly of the point of pivotal attachment, said bail extending well above the top of the dipper for increased purchase, a mucking section frame, a single sheave associated with the upper end of said bail, a pair of sheaves rotatably supported on said frame, a hoisting drum and driving means therefor, a compensating drum mounted on said shaft and having a diameter substantially twice the diameter of said pinion, and 4a cable operating from said compensating drum over one of said pair of sheaves, about said single sheave and over the other of said pair of sheaves and to said hoisting drum, whereby said dipper is supported in a plane determined by said hoisting drum irrespective of the advance or retractive movements of said crowd.

6. A hoisting system for a mucking machine having a dipper provided with a bail and backstop means for the bail, a crowd and driving means therefor and dipper sticks pivotally connecting the dipper to the crowd; comprising, a hoisting drum and driving means therefor; a compensating drum controlled and driven by said crowd and having a peripheral speed equal to twice the lineal speed of the crowd; a pulley on said bail, and a cable having its respective ends operatively connected tothe respective drums and intermediately cooperating with said pulley, whereby the dipper is maintained on an even keel during advance and retractive movements of the dipper while the hoisting drum remains Y driving means therefor, and means for driving said crowd; A compensating drum driven by said crowd and having a peripheral speed equal to twice the lineal speed of said crowd, and a cable having its opposite ends respectively connected to said hoisting drum and said compensating drum and intermediately passing about said pulley or sheave whereby said hoisting drum has normal and uniform eect in hoisting or lowering of the dipper irrespective of the advance or retractive movements of the dipper or the speed of such movements.

8. In a hoisting mechanism for a mucking machine having a dipper, a crowd, and dipper sticks connecting the dipper to the crowd, and hoisting means including a hoisting drum and driving means therefor and a cable; a rack on said crowd; a pinion cooperating with said rack, and driving means for said pinion; a compensating drum coaxially secured to said pinion and having a ropepitch diameter equal to twice the pitch diameter of said pinion; a sheave on said dipper; said cable having its opposite ends respectively operatively connected to said hoisting drum and to said compensating drum and intermediately cooperating with said sheave, establishing normal and uniform hoisting eiect of the hoisting druml on the dipper irrespective of advance and re-` tractive movements of said crowd and its associated dipper.

WILLIAM A. WHITMIRE. 

